Denon AVR-1910 Service Manual page 23

A
Input
CVBS or S
Input CVBS
Check V±5V，4094_PWR(+5V)
+5V： CN1018 3pin
-5V： CN1018 4pin
4094_PWR(+5V)： CN1018 1pin
OK
Check output of input selector.
Output V： IC1906 3pin
OK
Check output of OSD IC.
Output V： IC1905 13pin
OK
Check output of VIDEO buffer.
Output V： IC1901 24pin
OK
Check cable between main unit
and monitor or check monitor.
B
Input
COMPONENT
V±5V
+5V： CN1018 3pin
-5V： CN1018 4pin
OK
Check output of input selector.
Output Y： IC1907 24pin
Output Cb： IC1907 22pin
Output Cr： IC1907 20pin
OK
Check cable between main unit
and monitor or check monitor.
Input S
Check connection of
iPod Doc.
NG
To troubleshooting 1.1
Power not turn on.
NG
Check input selector and
surrounding circuitry soldering.
NG Check input of OSD IC.
Input V： IC1905 17pin
OK
Check surrounding circuitry
soldering of OSD IC.
NG Check input of VIDEO buffer.
Input V：
IC1901 12pin
OK
Check surrounding circuitry
soldering of VIDEO buffer.
NG
To troubleshooting 1.1
Power not turn on.
NG
Check input selector and
surrounding circuitry soldering.
23
AVR-1910/1620/1610/790/590
NG
Check output of VIDEO buffer
(IC1904B) and surrounding
circuitry soldering.
NG
Check output of VIDEO buffer
(IC19000A) and surrounding
circuitry soldering.